Question

I have a class with property type of Point ( struct in .NET Framework).
I use JsonConvert from Newton.Json to serialize it to JSON.
But result is

 "Point" : "100,100" 

Instead of

 "Point" : { X: "100", Y: "100"}

When I replace JsonConvert with standard JavascriptSerializer,
all works fine.

But I want to use JsonConverter from JSON.Net, because it’s much faster.

Answer 1

That’s because Point has defined its own TypeConverter and JSON.NET uses it to do the serialization. I’m not sure whether there is a clean way to turn this behavior off, but you can certainly create your own JsonConverter that behaves the way you want:

class PointConverter : JsonConverter
{
    public override void WriteJson(
        JsonWriter writer, object value, JsonSerializer serializer)
    {
        var point = (Point)value;

        serializer.Serialize(
            writer, new JObject { { "X", point.X }, { "Y", point.Y } });
    }

    public override object ReadJson(
        JsonReader reader, Type objectType, object existingValue,
        JsonSerializer serializer)
    {
        var jObject = serializer.Deserialize<JObject>(reader);

        return new Point((int)jObject["X"], (int)jObject["Y"]);
    }

    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(Point);
    }
}

You can then use it like this:

JsonConvert.SerializeObject(
    new { Point = new Point(15, 12) },
    new PointConverter())